Journal of the Chemical Society - Faraday Transactions p. 3301 - 3306 (1993)
Update date:2022-08-11
Topics:
Marchal, C.
Davidson, A.
Thouvenot, R.
Herve, G.
The preparation, characterization and catalytic properties of acids with the general formula H4PMo(11-x)WxVO40, x = 0-6, and their pyridinium salts are described.The (31)P NMR spectra reveal that the solids synthesized are mixtures of species with different x values.Three distinct stoichiometric ratios of W : Mo (1 : 10, 2 : 9, 3 : 8) have been used to vary the proportion of each species in these solids (labelled y = 1, 2 and 3).Their thermal stabilities and redox properties in solution are close to those of pure H4PMo11VO40.Their Broensted acidity increases in the order y = 1 < y = 2 < y = 3.Their catalytic properties for the oxydehydrogenation of isobutyric acid methacrylic acid are modified drastically.An important decrease in oxidative activity and an increase in acid activity are observed even with small amounts of tungsten.Tungsten may modify either the electronic transfer between the Keggin units or the oxygen lability.
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